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Mechanical Operations
Mechanical Operations Basic
Quiz 1
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Q.1
The ball mill can be best used for which kind of feed?
a) Wet and Dry
b) Coarse and Fine
c) Rocks and Bricks
d) Any kind of feed
Q.2
What is the ratio of length to diameter of tube mill?
a) 4:1
b) 3
c) Both 3 and 4:1
d) 1:2
Q.3
Which of the following forces act on the tumbling mill?
a) Tangential force
b) Centrifugal force
c) Circular force
d) Gravitational force
Q.4
Which of the following is true, when operating speed is less than critical speed?
a) No grinding
b) Effective grinding
c) Best grinding
d) Bold grinding
Q.5
What is the angle of nip for ball mill?
a) 4π2n2 (R-d)/g
b) 4π2n2 (R+d)/g
c) 4π2n2 (R-r)/g
d) 4π2n2 (R-n)/g
Q.6
At critical speed, α = 0 and cos α =what is critical speed?
a) n = nc
b) 2π = nc
c) g = nc
d) gn= nc
Q.7
What does the below equation represent?
a) Natural speed
b) Full speed
c) Optimum speed
d) Critical speed
Q.8
What is percentage of tumbling mill speed?
a) 80 to 100%
b) 65 to 80%
c) 50 to 90%
d) 10 to 50%
Q.9
Which of the following uses shearing action?
a) Buhrstone mill
b) Tumbling mill
c) Rod mill
d) Ball mill
Q.10
What is the feed size for a buhrstone mill?
a) Size of peat
b) Size of rock
c) Size of grain
d) Any size
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